Host an Event Volunteer Join Tickets

Support the plant database you love!

Share

Plant Database

Search for native plants by scientific name, common name or family. If you are not sure what you are looking for, try the Combination Search or our Recommended Species lists.

Enter a Plant Name:
Or you can choose a plant family:
Hypericum ascyron (Great st. john's-wort)
Smith, R.W.

Hypericum ascyron

Hypericum ascyron L.

Great St. John's-wort, Giant St. John's-wort

Clusiaceae (Mangosteen Family)

Synonym(s): Hypericum pyramidatum

USDA Symbol: HYAS80

USDA Native Status: L48 (N), CAN (N)

A stout, erect, 2-6 ft. plant with large, elliptic leaves and 2 in., yellow, 5-petaled flowers with very bushy stamens.

The scattered distribution of this plant in Ontario is thought to match historical aboriginal encampments. (Ontario Native Plants 2002)

 

From the Image Gallery

2 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Herb
Fruit Type: Capsule
Size Notes: Up to about 6 feet tall.
Leaf: Green

Bloom Information

Bloom Color: Yellow
Bloom Time: Jun , Jul , Aug

Distribution

USA: CT , DE , IA , IL , IN , KS , MA , MD , ME , MI , MN , MO , NE , NH , NJ , NY , OH , PA , VT , WI , WV
Canada: ON , QC
Native Distribution: Que. to MN, s. to NJ, PA, IN, s.w. IA & n.e. KS
Native Habitat: Moist places; stream banks; thickets; rich woods

Growing Conditions

Water Use: Medium
Light Requirement: Sun , Part Shade , Shade
Soil Moisture: Moist , Wet
CaCO3 Tolerance: Low
Soil Description: Moist soils

Benefit

Conspicuous Flowers: yes

Value to Beneficial Insects

Special Value to Native Bees

This information was provided by the Pollinator Program at The Xerces Society for Invertebrate Conservation.

Propagation

Seed Treatment: Cold stratify.
Commercially Avail: yes

National Wetland Indicator Status

Region:AGCPAKAWCBEMPGPHIMWNCNEWMVE
Status: FAC FAC FAC FAC
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1 (Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here for map of regions.

From the National Organizations Directory

According to the species list provided by Affiliate Organizations, this plant is on display at the following locations:

Mt. Cuba Center - Hockessin, DE

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Hypericum ascyron in USDA Plants
FNA: Find Hypericum ascyron in the Flora of North America (if available)
Google: Search Google for Hypericum ascyron

Metadata

Record Modified: 2023-02-14
Research By: TWC Staff

Go back